raku pottery glaze

Raku Glaze

January Raku Pottery Glaze: Forbes Cobalt Crust #2

Gerstley Borate                  57%
Synthetic Bone Ash            19
Nepheline Syenite               10
EPK                                    9
Silica                                   5

Add:
Copper Carbonate                 8
Cobalt Carbonate                  2
Silica                                   5

Fired to 1900 F with heavy post firing reduction using newspaper.  No burping.

Raku Glaze

October Raku Pottery Glaze: Shiny Copper Flash

The flashing will vary with each firing. This was fired to 1875F and given medium post-firing reduction using newspaper after pulling from the kiln.

Oct Glaze of the Month

Shiny Copper Flash

%75 Gerstley Borate
      %12.5  Nepheline Syenite
      %12.5  EPK

    Add:
       %8 Copper Carbonate
       %2 Cobalt Carbonate
     

Raku Glaze

September Raku Pottery Glaze: Copper Matt

The flashing will vary with each firing.  Both of these were fired to 1875F and given medium post-firing reduction using newspaper after pulling from the kiln.

Copper Matt

Add

%75 Gerstley Borate
      %12.5  Nepheline Syenite
      %12.5  EPK

    Add:
       %8 Copper Carbonate
       %2 Cobalt Carbonate

  Add:
       %16 Synthetic Bone Ash


     

Raku Glaze

August Raku Pottery Glaze: Emerald Green Copper Flash

The raku glaze of the month is a greenish blue with copper flashes that will vary from firing to firing.

Raku Pottery Glaze of the Month | August

Emerald Green Copper Flash Glaze

Frit 3110:                                  30%
Frit 3124:                                  20%
Gerstley Borate:                       30%
Nepheline Syenite:                   20%
Copper Carbonate:                   5%

Raku Glaze

June Glaze: Forbes Midnight Blue

Midnight Blue is a rich cobalt blue with red streaks in post firing reduction.  Stay tuned for this month's pot which features previous glazes of the month:  Blue Moon, Lime Green and Sassy Fat White/Silver Slither, in addition to this month's Midnight Blue.  

Forbes Midnight Blue Glaze

Frit 3110                          68%
Custer Feldspar                18%
EPK (Kaolin)                      9%
Lithium Carbonate               5%
Copper Carbonate               4%
Cobalt Carbonate                2%
Hectorite                            2% (or Bentonite 1%)

Raku Glaze, Press & News

May Glaze : Forbes Sassy Fat White

With Silver Nitrate added I call this glaze Silver Slither, which is pictured.  This glaze has to be fired hot to about 1950F for the platelets to form beads.  it looks different on top of a variety of base glazes as you can see from the photos.  Works best on shoulder of pieces or on a more horizontal surface.  Mix on the thick side.  I usually apply a very small amount at a time by either pouring or brushing.  When I pour it, I often will blow on it to move it around.

Raku Pottery Glaze Recipe

Frit 3110                        85%
Nepheline Syenite            5
EPK                              10
Add:
Tin Oxide                        7
Magnesium Carbonate    34
Hectorite                         2  or Bentonite    1
Optional:  Silver Nitrate    2

Press & News

April Glaze : Lime Green Crackle

Lime Green Crackle glaze is fired to 1900 degrees F, pulled from the kiln and reduced in a small can with newspaper.

RAKU POTTERY GLAZE RECIPE

Frit 3110                  58%
Frit 3269                  10
Nepheline Syenite:   22
EPK (Kaolin)             5
Silica                        5
Add:
Chrome Oxide          .4 (point 4)
Tin Oxide                  3
Hectorite                   2  or Bentonite  1%

This month's glaze is a revision of my March Glaze called Lime Green Crackle. Stay tuned for a silver glaze recipe next month!

This glaze is fired to 1900 degrees F, pulled from the kiln and reduced in a small can with newspaper.  Lid is put on immediately. Wait about 2 1/2 minutes and remove the lid.  Rub the top of pot with torn newspaper using gloves.  Once paper ignites cover can again immediately and let cool (you may have to use a torch to reignite the paper).